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Diffeomorphism classes of the doubling Calabi-Yau threefolds with Picard number two

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arxiv 2101.11841 v3 pith:E5XUATIY submitted 2021-01-28 math.AG math.ATmath.DG

classification math.AGmath.ATmath.DG
keywords threefoldscalabi-yaudoublingfanonumberpicardclassesdiffeomorphism
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abstract

Previously we constructed Calabi-Yau threefolds by a differential-geometric gluing method using Fano threefolds with their smooth anticanonical $K3$ divisors (New York J. Math. 20: 1-33, 2014). In this paper, we further consider the diffeomorphism classes of the resulting Calabi-Yau threefolds (which are called the doubling Calabi-Yau threefolds) starting from different pairs of Fano threefolds with Picard number one. Using the classifications of simply-connected $6$-manifolds in differential topology and the $\lambda$-invariant introduced by Lee (J. Math. Pures Appl. 141: 195-219, 2020), we prove that any two of the doubling Calabi-Yau threefolds with Picard number two are not diffeomorphic to each other when the underlying Fano threefolds are distinct families.

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  1. Smoothing toroidal crossing spaces

    math.AG 2019-08 conditional novelty 8.0 of 10

    A proof that toroidal crossing spaces with a simple logarithmic section and a transverse anticanonical divisor admit smoothings, together with a proof of Danilov's Hodge-de Rham degeneration conjecture.

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